Rotary kiln for burning cement, ore, and similar materials



July 12, 1949. L. D. PARKER 2,475,754

ROTARY KILN FOR BURNING CEMENT, ORE, AND SIMILAR MATERIALS Filed Dec.' 19, 1944 2 Sheets-Sheet 1 Inventor LnoNEI. bout-m5 Mme A llornev July 12, 1949. D. PARKER 2,475,754

ROTARY KILN FOR BURNING CEMENT, ORE, AND SIMILAR MATERIALS v Filed Dec. 19, 1944 2 Sheets-Sheet 2 Inventor LIONEL 'DOUG'LIRB PARKER mwww Attorney Patented July 12, 1949 ROTARY KILN FOR BURNING CEMENT, ORE, AND SIMILAR MATERIALS Lionel Douglas Parker, Barrow-in-Furness, England, assignor to Vickers-Armstrongs Limited, London, England, a company of Great Britain Application December 19, 1944, Serial No. 568,869 In Great Britain December 22, 1943 2 Claims.

This invention relates to rotary kilns for burning cement, ore, and similar materials, its chief objects being to enable the material to be fed to the kiln in a dry state if desired, and to pre-heat the said material rapidly and efliciently.

According to this invention, to enable the material to be fed to the kiln dry, if desired, and to pre-heat this material eificiently, it is divided up into a number of portions, each of which is conveyed inside one of a number of tubes situated inside the kiln. These tubes are arranged in a circle and are longitudinal with the kiln, hot gases for pro-heating travelling in a direction substantially opposite to that of the travel of the material, the said gases being caused to pass around the tubes and radially outward between the tubes on their way to the gas exit.

In order that the present invention may be clearly understood and readily carried into effect, the same will now be more fully described with reference to the accompanying drawings, which illustrate an exemplification of the invention.

Figure 1 represents a portion of a kiln in longitudinal vertical section.

Figure 2 represents a section taken on the line IIII in Figure 1.

Figure 3 is a section on the line IIIIII in Figure 1.

Figure 4 is a section on the line IV-IV in Figure 1.

In the drawings, A indicates the shell of a rotary kiln, and a a easing into which the material is fed. From the casing a as the kiln rotates it is scooped up by buckets b into a central chamber provided with helical guides 11 to convey it past the scoop openings. Thence it falls through radial chutes e into the longitudinal tubes 7, which convey it to discharge chutes g mounted on a cone h, which may be of steel lined with brick, the said cone being attached to the kiln shell A and forming a reduced outlet for the kiln gases. The material is delivered between the cone h and the kiln shell out of the way of the gases. Renewable spiral lifters k are provided at this point to lead the material away from the discharge chutes g. The gases are drawn in through the nose of the cone h and over the point of feed of the material into the kiln proper, then passing along and around the aforesaid longitudinal tubes 1 and radially outward between the said tubes. The gases then travel past the feed scoops or buckets b to the mouth m of the kiln and thence on through the kiln fines to the induced draught fan. The arrows indicate the travel of the heating gases.

I claim:

1. In a rotary kiln for burning cement, ore, and similar materials wherein the material treated is divided up into a number of portions, each of which is conveyed inside one of a number of tubes situated inside the kiln, the said tubes being arranged in a circle and longitudinal with the kiln, hot gases for preheating travelling in a direction substantially opposite to that of the travel of the material, the said gases being caused to pass around the tubes and radially outward between the tubes on their way to the gas exit, a conical member having its base attached to the kiln shell, the said conical member having a relatively wide mouth serving for the free entrance of the hot gases to the kiln, a plurality of discharge chutes mounted on the tapered wall of the conical member and serving to discharge the treated material downwardly and rearwardly between the wall of said conical member and the kiln shell and out of the path of said gases entering the mouth of said conical member.

2. Apparatus as claimed in claim 1 having lifting means for conveying the treated material away from the point of discharge of said chutes.

LIONEL DOUGLAS PARKER.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,171,143 Ruggles Feb. 8, 1916 1,221,412 Bernard Apr. 3, 1917 1,995,948 Shatter Mar. 26, 1935 2,026,441 Shafter Dec. 31, 1935 2,159,239 Vogel-Jorgensen May 23, 1939 2,283,129 Roubal May 12, 1942 

